Music/Pop Culture
I really enjoy Tom Gabel’s (of Against Me!) blog, although he only seems to update it every so often. Has some great info on his upcoming solo record.
http://ifeelsicktomystomach.blogspot.com/

Also, I really like Brendan Kelly of the Lawernce Arms, he doesn’t really write much about music, but he’s incredibly funny, and a good writer. (Make sure you read everything, especially the tags if you check out his site). Since his band doesn’t really sell millions of records, when he’s not touring, he works as a bartender, and takes improve classes, great stuff.
http://badsandwichchronicles.blogspot.com/

I’m a total Kevin Smith fanboy, so obviously I’m going to read his blog, it comes off as more of a diary at times, but he knows how to keep a reader interested.
http://silentbobspeaks.com/

Politics

Since I’m a godless, gun hating liberal I read the Daily Kos. Obviously biased, but great at getting a second look at things reported in other sources (ie the NY Times, ect)
http://www.dailykos.com/

I also read Warren Kinsella, the infamous Canadian liberal political strategists, and part time punk rocker. He blogs on various things, from Canadian politics, his family life, to the punk scene.
http://warrenkinsella.com/